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74666881 = 86412
BaseRepresentation
bin1000111001101…
…01001110000001
312012111110201001
410130311032001
5123103320011
611224212001
71564441462
oct434651601
9165443631
1074666881
1139169373
122100a001
1312613ab3
149cb8d69
15684d7c1
hex4735381

74666881 has 3 divisors (see below), whose sum is σ = 74675523. Its totient is φ = 74658240.

The previous prime is 74666849. The next prime is 74666887. The reversal of 74666881 is 18866647.

It is a happy number.

The square root of 74666881 is 8641.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2076481 + 72590400 = 1441^2 + 8520^2 .

It is not a de Polignac number, because 74666881 - 25 = 74666849 is a prime.

It is a super-2 number, since 2×746668812 = 11150286236536322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74666887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4321 + ... + 12961.

It is an arithmetic number, because the mean of its divisors is an integer number (24891841).

Almost surely, 274666881 is an apocalyptic number.

74666881 is the 8641-st square number.

74666881 is the 4321-st centered octagonal number.

It is an amenable number.

74666881 is a deficient number, since it is larger than the sum of its proper divisors (8642).

74666881 is an frugal number, since it uses more digits than its factorization.

74666881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17282 (or 8641 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The cubic root of 74666881 is about 421.0910427619.

The spelling of 74666881 in words is "seventy-four million, six hundred sixty-six thousand, eight hundred eighty-one".

Divisors: 1 8641 74666881